Stock fuel hardline to the rail: Do they make a 5/16 (#5) to 3/8 (#6) adapter?

[codyace]

For the longest time, this has been the most ghetto part on my car (well at least to me. I've got the stock fuel rail, into a z32 filter, then into 5/16 fuel line (with a fuel pressure gauge thingy inline) to 5/16 hose that I shoved somehow onto a #6 a/n fitting.... (FPR on the other end is a Nismo, back into the stock return via regular 5/16 fuel hose). It's worked fine now for 2 years, and countless HPDE miles, and tons of beatings, but I just hate seeing stuff like this rigged up (I know I shouldn't even touch it, but I'm anal that way)


I'd love to change this up and do it right. Ideally, I'd love to just flare the top end of the z32 filter line, and find a way to put a -6 female end on it, but can't seem to find one. That, or do this off of the stock fuel rail itself, and run a domestic style inline -6 in/out filter.....


Just looking for opinions and ideas...

[Koopa Troopa]

Didn't you already do what you're asking by taking a 3/8 fitting and shoving a hose through it?

If it's a factory copper/steel line then just buy some spare lines, bend them and flare the ends with whatever fitting you want... Problem solved right?

[codyace]

Didn't you already do what you're asking by taking a 3/8 fitting and shoving a hose through it?

If it's a factory copper/steel line then just buy some spare lines, bend them and flare the ends with whatever fitting you want... Problem solved right?

The issue is that I don't like having the 5/16 (-5) hose shoved onto the 3/8 (-6) fitting. I dunno I'm wierd...It's not leaking, but it just doesn't seem 'right' ya know?


And the issue still remains, on creating a 'step' from 5/16 to 3/8 line. I could potentially run a new line from my 2nd pump forward (npt to -6 adapter)....but it would be much easier to just flare the filter outlet, and find a adapter from -5 to -6 JIC (or a/n, whatever you want to call the 37 degree stuff).....

[Koopa Troopa]

The issue is that I don't like having the 5/16 (-5) hose shoved onto the 3/8 (-6) fitting. I dunno I'm wierd...It's not leaking, but it just doesn't seem 'right' ya know?


And the issue still remains, on creating a 'step' from 5/16 to 3/8 line. I could potentially run a new line from my 2nd pump forward (npt to -6 adapter)....but it would be much easier to just flare the filter outlet, and find a adapter from -5 to -6 JIC (or a/n, whatever you want to call the 37 degree stuff).....


I dunno.. You're getting answers from a guy who bent his clutch line backwards, cross threaded the fitting into the slave cylinder so it wouldn't leak and used a ziptie to secure it in place...

Why not hack the other fitting off the filter outlet and weld a new fitting on? You already know what you need to do dude... :bigok:

[Mirage]

http://www.honda-tech.com/zerothread?id=1964900&postid=27569470#27569470
Is that what your thinking, i'm pretty sure I measured it for a friend and the stock hardlines are 8mm, i'd imagine the fuel filter is the same. If not, they make standard size flare to an adapters.

or, you can get a steel -6 an braze/weld on fitting for the fuel rail side, but you gotta make sure all the plating is stripped off the weld area or chances are it will leak.

[codyace]

http://www.honda-tech.com/zerothread?id=1964900&postid=27569470#27569470
Is that what your thinking, i'm pretty sure I measured it for a friend and the stock hardlines are 8mm, i'd imagine the fuel filter is the same. If not, they make standard size flare to an adapters.


That is exactly what I was looking for. For 28 dollars it's worth my time alone. Posi rep!

Why not hack the other fitting off the filter outlet and weld a new fitting on? You already know what you need to do dude... :bigok:

Haha, I can say I've done this before on an enduro car we needed to repair on the spot lol....

[McRussellPants]

Yeah, earls makes a 5/16th to 6an compression fitting.

they work pretty well I think.

[codyace]

Yeah, earls makes a 5/16th to 6an compression fitting.

they work pretty well I think.

https://www.jegs.com/webapp/wcs/stores/servlet/productitem_10001_10002_749418_-1_79838

Use these aluminum tubing adapters to connect a bare end of a hard tube to a fitting. 50 psi max. Sold 1/pkg.

Well isn't that a shitty disclaimer. Maybe I'll hafta give earls a call to see their opinion on this :/

[McRussellPants]

Dunno about that, I've seen them used on EFI LS1s just fine.

http://www.thirdgen.org/techboard/alternative-port-efi-intakes/397519-cutting-flaring-fuel-lines.html

I thought about doing all this jazz and finally stopped caring, probably get samco fuel/hose line and call it a day.

eidt: wtf someone already posted this, do it like this.
http://honda-tech.com/zerothread/1527379

[sean350z]

What's the psi rating on those goodridge fittings? The goodridge catalog says they are good for oil, fuel, etc but no mention on pressure rating.

I was going to run -6 line from the hardlines with clamp on fittings which would seem to work fine, but if this works I might as well scrap the clamp ons.

[sean350z]

Did you ever call Earls Cody? I am thinking about flaring my fuel line to 37 degrees and using the flared fittings that can hold upto 5000psi.

I measured the diameter of the fuel line and it seems to be around .3175" and the -6an flared fitting is .375" so I'm not sure about with that extra .06" maybe leaking.

Earls does however has a 5an hardline fitting (EAR-581805ERL) (EAR-581905ERL) that OD is .3125" which then all you would need is a 5an to 6an converter. Tighter is better IMO.

Let me know.

[Def]

Get a flaring tool, then buy a -6 AN tube nut and sleeve. Flare the end of the fuel filter tube.

Then you can flare tubes as you please, and tube nuts and sleeves are dirt cheap(less than a buck a piece in that size).

Even if the fuel filter outlet is only 5/16" you can still get a -6 AN sleeve and tube nut to work on it just fine. That's how I did my powersteering line by just cutting the stock flare off and putting a -6 AN nut on it.

[codyace]

Dunno about that, I've seen them used on EFI LS1s just fine.

True, but at max boost now, the car is in the mid 60 Fuel Pressure, and with a possible 4 bar setup, it will be in the 80 range....much higher than an N/A LS1 requires. Funny you posted that link though, as my Fbody friend sent me the same link :D

eidt: wtf someone already posted this, do it like this.
http://honda-tech.com/zerothread/1527379

Seeing that now, and having the Flare tools at the shop, I should have just known better to go this route and be done. I guess I love over complicating a 10 minute job lol



Did you ever call Earls Cody? I am thinking about flaring my fuel line to 37 degrees and using the flared fittings that can hold upto 5000psi.


Didn't get a chance to call, as I've been swamped this past week with work, school, working out, and just life. Plus I have my Manifold at Enthalpy's to get the w/g flange welded on, and the ECU back out to JWT for a higher launch control and potentially a race map, so I've lost a bit of motavation hehe.


Even if the fuel filter outlet is only 5/16" you can still get a -6 AN sleeve and tube nut to work on it just fine. That's how I did my powersteering line by just cutting the stock flare off and putting a -6 AN nut on it.

That's what I was always under the impression of as well, as it's exactly what we do to repair tranny coolers that leak and or get ripped off on the later model Freightliners. I forget the 'exact size' of the line, but we end up using a next size up JIC fitting and it works just fine....


Looks like I'll be heading down to the supply house and getting everything I need. To easy!

[UNISA JECS]

Funny that im kind of looking for a similar thing for my coolant lines for my KA-T setup. Since only -6 AN 11/32" I.D. (8.73mm I.D.) are availble for use with SS lines (8.73mm I.D.) and the stock nissan hardlines for coolant near the throttle body where I wanna tap from are 5/16" O.D. (7.93mm O.D.) I think I might have to try this, use a -6 AN sleeve and tube nut.

I also found this dont know if this would be helpful:

http://aeromotive.carshopinc.com/product_info.php/products_id/3276/

5/16" to -6 AN Male

http://i167.photobucket.com/albums/u159/zilvia_album/5-16to-6AN.jpg

[sean350z]

That's an expensive fitting at 33 bucks...

4 bucks for 2 tube nuts and sleeves is a steal. I'm picking some up this afternoon to start my lines.

[sean350z]

I just got some 6an tube nuts from a local store and flared some pipe and 6an just doesn't fit right. I mean it would probably work but if your anal I'd go 5an.

[codyace]

Thanks for responding. I called earls, they said 60 psi limit on that fitting, so certainly a no go for me (esepcially if and when I go 4 bar fuel)

Looks like I'll get the -5 stuff, and a conversion -5 to -6 adapater just for my own sake of mind.

THanks again!

Unisa: That's a sweet piece!

[sean350z]

I rigged mine up this weekend with 5an tube nuts and 6an adaptors. Everything fits nice and perfect. You might need to sand down some of the paint on the hardlines to get the tube sleeve to fit on. I'm not sure what I'm going to do for the rail now because my flare tool along with the tube nut will not fit before the bends. I might just run a small section of hose from the regulator and return to a barb fitting with npt threads then npt to an. Any suggestions?

[sean350z]

ChaChing

http://lh4.google.com/Sean350z/R7Td-G2XHEI/AAAAAAAAAcE/Qi4Kzu2tEJc/s800/fuelline.jpg

[codyace]

That's exactly what I'll be doing. Just debating if I'm gonna be a cheapy and flare the Z32 filter ot where you did......